doc/developer: Clarify symbol naming prefixes section.
configure: Enable hwaccels without external dependencies by default.
lavu/eval: add between() function.
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  configure: Enable hwaccels without external dependencies by default.
  doc/developer: Clarify symbol naming prefixes section.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Fix compilation with --disable-mmx.
Fix compilation with --disable-everything --enable-parser=h264.
img2: WebP support

Reviewed-by: Pascal Massimino <pascal.massimino@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
vp8: WebP decoding support

VP8L, padding and bounds checks by Pascal Massimino

Reviewed-by: Pascal Massimino <pascal.massimino@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
matroskadec: switch to av_assert

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
h263dec: switch to av_assert()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/frame: add all remaining frame properties to av_frame_copy_props

Signed-off-by: Anton Khirnov <anton@khirnov.net>
af_asyncts: fix compensation and PTS monotonicity

This patch improves af_asyncts behavior on streams with bogus PTS, which
are either non-monotonic, or contain PTS jitter, and trigger the
non-monotonicity error. With this patch, af_asyncts is able to correct
these streams and avoid the error.

Firstly, it fixes resample compensation calculation by supplying proper
units to avresample_set_compensation (sample count per second instead
of sample count per some arbitrary frame size). Also, the calculation of
the compensation itself is fixed - delta is proportional to an adjustment
of the compensation, not the compensation itself. Ideally, the compensation
should converge to a value that keeps delta at zero.

To be able to deal with sources with PTS jitter even without resampling,
small PTS errors are adjusted, so the output frames do not overlap.

Finally, one more monotonicity check is added.

The FATE reference changes because now there is 8 less samples of
silence because of the pts jitter.

Signed-off-by: Jindřich Makovička <makovick@gmail.com>
tscc2: allocate AVFrame properly.
FATE: add a tscc2 test.
Fix typo in dvvideo decoder dependencies.

Fixes compilation with --disable-everything --enable-decoder=dvvideo
fate: add test for cropping h264 to container dimensions

Tests the workaround added for 1080 videos created with Canon cameras
in 30f515091c323da59c0f1b533703dedca2f4b95d.
x86/h264_qpel: switch to av_assert

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
x86/mpegvideo: switch to av_assert

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavc/prores: restore pict_type and key_frame setting.
lavfi/blend: always peek the first frame of each queue.

Before the change, filter_frame() always waited for 2 samples in the
bottom frames queue. This notably fixes commands such as
./ffplay tests/lena.pnm -vf split,blend=c0_mode=addition